Kannel Box that acts as SMPP Server

OpenSMPPBox is a special Kannel box that listens for smpp connections and accepts
and sends sms messages from and to smpp clients.
OpenSMPPBox behaves similar to other Kannel boxes and share a compatible
configuration file format and command line options.
After starting opensmppbox, a new connection to bearerbox is made for each
smpp client that is connecting. This (new) connection with it's own
'smsbox-id' is dedicated to sending and receiving messages for this particular
smpp client.